Flawfinder version 2.0.10, (C) 2001-2019 David A. Wheeler.
Number of rules (primarily dangerous function names) in C/C++ ruleset: 223
Examining data/pngtools-0.4/pngchunks.c
Examining data/pngtools-0.4/pngwrite.c
Examining data/pngtools-0.4/pngchunkdesc.c
Examining data/pngtools-0.4/pngcp.h
Examining data/pngtools-0.4/inflateraster.c
Examining data/pngtools-0.4/pngcp.c
Examining data/pngtools-0.4/pnginfo.c
Examining data/pngtools-0.4/pngread.c

FINAL RESULTS:

data/pngtools-0.4/pngcp.c:41:21:  [3] (buffer) getopt:
  Some older implementations do not protect against internal buffer overflows
  (CWE-120, CWE-20). Check implementation on installation, or limit the size
  of all string inputs.
  while ((optchar = getopt (argc, argv, "d:s:")) != -1)
data/pngtools-0.4/pnginfo.c:96:21:  [3] (buffer) getopt:
  Some older implementations do not protect against internal buffer overflows
  (CWE-120, CWE-20). Check implementation on installation, or limit the size
  of all string inputs.
  while ((optchar = getopt (argc, argv, "tDd")) != -1)
data/pngtools-0.4/pngchunkdesc.c:24:1:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
char *meanings[4][2] = {
data/pngtools-0.4/pngchunkdesc.c:34:3:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
  char s[200];
data/pngtools-0.4/pngchunks.c:20:5:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
    char c[4];
data/pngtools-0.4/pngchunks.c:24:1:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
char *meanings[4][2] = {
data/pngtools-0.4/pngchunks.c:52:13:  [2] (misc) open:
  Check when opening files - can an attacker redirect it (via symlinks),
  force the opening of special file type (e.g., device files), move things
  around to create a race condition, control its ancestors, or change its
  contents? (CWE-362).
  if ((fd = open (argv[1], O_RDONLY)) < 0)
data/pngtools-0.4/pngcp.c:46:21:  [2] (integer) atoi:
  Unless checked, the resulting number can exceed the expected range
  (CWE-190). If source untrusted, check both minimum and maximum, even if the
  input had no minus sign (large numbers can roll over into negative number;
  consider saving to an unsigned value if that is intended).
	  targetbitdepth = atoi(optarg);
data/pngtools-0.4/pngcp.c:51:21:  [2] (integer) atoi:
  Unless checked, the resulting number can exceed the expected range
  (CWE-190). If source untrusted, check both minimum and maximum, even if the
  input had no minus sign (large numbers can roll over into negative number;
  consider saving to an unsigned value if that is intended).
	  targetchannels = atoi(optarg);
data/pngtools-0.4/pnginfo.c:146:12:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
  unsigned char sig[8];
data/pngtools-0.4/pnginfo.c:154:16:  [2] (misc) fopen:
  Check when opening files - can an attacker redirect it (via symlinks),
  force the opening of special file type (e.g., device files), move things
  around to create a race condition, control its ancestors, or change its
  contents? (CWE-362).
  if ((image = fopen (filename, "rb")) == NULL)
data/pngtools-0.4/pngread.c:17:12:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
  unsigned char sig[8];
data/pngtools-0.4/pngread.c:22:16:  [2] (misc) fopen:
  Check when opening files - can an attacker redirect it (via symlinks),
  force the opening of special file type (e.g., device files), move things
  around to create a race condition, control its ancestors, or change its
  contents? (CWE-362).
  if ((image = fopen (filename, "rb")) == NULL){
data/pngtools-0.4/pngwrite.c:16:15:  [2] (misc) fopen:
  Check when opening files - can an attacker redirect it (via symlinks),
  force the opening of special file type (e.g., device files), move things
  around to create a race condition, control its ancestors, or change its
  contents? (CWE-362).
  if((image = fopen(filename, "wb")) == NULL){
data/pngtools-0.4/pngchunkdesc.c:38:9:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
      s[strlen (s) - 1] = '\0';

ANALYSIS SUMMARY:

Hits = 15
Lines analyzed = 1083 in approximately 0.04 seconds (26071 lines/second)
Physical Source Lines of Code (SLOC) = 726
Hits@level = [0] 106 [1]   1 [2]  12 [3]   2 [4]   0 [5]   0
Hits@level+ = [0+] 121 [1+]  15 [2+]  14 [3+]   2 [4+]   0 [5+]   0
Hits/KSLOC@level+ = [0+] 166.667 [1+] 20.6612 [2+] 19.2837 [3+] 2.75482 [4+]   0 [5+]   0
Minimum risk level = 1
Not every hit is necessarily a security vulnerability.
There may be other security vulnerabilities; review your code!
See 'Secure Programming HOWTO'
(https://dwheeler.com/secure-programs) for more information.